21182748210 has 80 divisors (see below), whose sum is σ = 61339475736. Its totient is φ = 5214212352.

The previous prime is 21182748203. The next prime is 21182748239. The reversal of 21182748210 is 1284728112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18441911601 + 2740836609 = 135801^2 + 52353^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 995299 + ... + 1016358.

Almost surely, 2^21182748210 is an apocalyptic number.

21182748210 is an abundant number, since it is smaller than the sum of its proper divisors (40156727526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21182748210 is a wasteful number, since it uses less digits than its factorization.

21182748210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011689 (or 2011680 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The spelling of 21182748210 in words is "twenty-one billion, one hundred eighty-two million, seven hundred forty-eight thousand, two hundred ten".